Compression-indicator.



A. L. LAIVIBETH.

COMPRESSION INDICATOR.

APPLICATION men MAYM. I917.

Patented Nov. 26, 1918 atto'z e11 UNITED STA Acmrn LAMBETH, or MINERAL WELLS, TEXAS, ASSIGNOB To s. H. HEDICK, SECRE- TABY, A. m. nnmox, E. J. BEACH, AND MATT FARREB, ALL or MINERAL WELLS,

TEXAS.

To all whom it may concern:

Be it known that I, Aonr L. LAMBETH, a

'a citizen of the United States of America,

residing at Mineral Wells, in the county of Palo Pinto and State of .Texas, have invented certain new and useful Improvements in Compression-Indicators, of which the following is a specification.

My invention relates to a testing dev ce for determining the compression engine cylinders and particularly to indicators for explosive engine cylinders, and the ob ect is to provide a simple and highly efiicient device for quickly testing the compression in engine cylinders. Other objects and advantages will be fully explained in the following description and the invention will be more particularly pointed out in the claims. Referenceis had to the accompanying drawin s which form a part of this application.

igure 1 is a side elevation of the indicator, being shown inserted in place of a spark plug of an internal combustion engine for testing the compression. Fig. 2 is an passage through the device, this form enlarged vertical section of the casing and indicator plunger, showing a variation in the connecting means. Fig. 3 is a side ele--.

vation of the indicator plunger. Fig. 4 is a plan view of the back check valve. Fig. 5 is a vertical section of a ball valve casing or holder, showing a ball for closing the emg a variation from the formshown in the previous views. 1

Similar characters of reference are used to indicate the same parts throughout the several views. I

This invention includes a. cylindrical hollow plug 1 which is to be inserted into some opening in the engine cylinder. The; drawings show a section of a cylinder with the spark plug removed and the indicator put in the place of the plug. When this is done,

the engine can be started so that the pressure can be tested by the explosive mixture risin in the indicator plunger 2. A tubular ho der and guide 3 is mounted in the member 1 and rests on the annular shoulder 4, in casing 1. The openingthrough the outer end of the holder 3is large enough for the Specification of Letters Patent. '4 Application filed May 14,1917. Serial No. 168,438.

COMPRESSION-INDICATOR.

Patented Nov.

movement of the lunger 2 but the holder fits the plunger snug y. The holder and guide 3 is cored out for a. portion of the length thereof to provide for the movement of an annular bead 5 formed on the indicator. The bead 5 fits snugly in the out out or enlarged interior part of the holder and guide 3. The end 6 of the casing 1 is forged or swaged to inclose the end of the holder 3 and to fit closely about the plunger 2 and thus to form a binding cap for the holder 3. A valve 7 is provided as a check valve and this valve rests on the annular seat 4 in casing 1. The valve 7 has lugs 8 which pro- Ject into recesses 9 in casing or holder 3,

- the recesses being necessary for the movement of the valve to let the pressure fluid pass up within the plunger or indicator 2. The pressure fluid will lift the valve from its seat and pass upwardly between the valve and its holder. Additional connecting members 10 may be provided for making connections where a smaller or a larger opening than the threaded portion of casing 1 is found so that the member 10 can be screwed on the member land then the member 10 screwed into opening of the engine to be tested.

A ball valve 11 may be used instead of the valve 7.

Numbers to indicate the pressure may be printed or stamped on the side of the plunger 2. Various changes in the sizes, proportions, and construction may be made in the indicator without departing from my invention.

What I claim, is,

1. A pressure indicator comprising a cylindrical plug and housing having its in ner end threaded and having an annular interior shoulder, a guide member mounted in said housing and supported on said shoulder, a valve in. said guide member normally resting on said shoulder, said plug being swaged over the end of said guide member at the outer end and inclosing the guide member, and a plunger indicator mounted in said guide member and being adapted to move therein and project through the end of a ha vlng it stop to limit the movement of said screwed lnto an englne cylinder, sald hollow plunger indicator. plug forming a binding cap engaging the L. A pressureindicatorincludingzi gl'aduouter end of said guide for inclosing and 10 V l plunger and a guide therein and clamping the same in said plug. n cans for connecting the indicator to an In testimony whereof, I set my hand, this ine cylinder consisting of a cylindrical 24th day of April, 1917.

lxollnw plug having its end threaded to be ACEY L. LAMBETH. 

